Hi Jean and welcome to the Pool Forum!
The first thing we need you to do is to post some current water testing results taken with a drops-based kit. Then we'll better be able to advise you.
I'm estimating your volume to be around 7200 gallons. In this size pool, each quart (32-oz.) of bleach will only raise the chlorine level to about 2ppm which is not nearly high enough to kill algae. Without knowing your readings, I'm going to suggest that you add 1-1/2 gallons of plain, household 6% bleach slowly into the skimmer. That should take your chlorine up to around 12.
Do you have a test kit? If not you need one. The one we recommend is the Taylor K-2006 or 2006C (same kit, larger bottle of some reagents). If you buy it through the Amazon link in my signature, the Pool Forum makes a little money on the sale which helps us keep this form online. Only buy if the seller is Amato Industries, however. Some other sellers are substituting the K-2005 which you do NOT want. If Amato isn't listed, wait a day or two and try again. They seem to restock pretty quickly when they sell out.
In the meantime, do two things. First of all, go to a reputable pool store and let them test your water for you. Make sure that the CYA test is one of the tests they run. Post your results here. (Do not buy all the things they are going to tell you that you need!)
Also, go to Walmart and pick up a cheap OTO/Phenol Red kit (yellow and red drops). Until you can get a better kit, use the OTO kit to test the water as many times per day as you can --- minimum of morning and evening and more often than that is even better -- and each time, add enough bleach to get the chlorine level back up to about 12. Use the one quart = 2ppm as a reference to help you figure out how much bleach to add each time you test. Continue to shock the pool to 12ppm until you can go from sundown one evening until sunup the next morning without losing more than 1ppm of chlorine. Then you'll be able to let the cl drift down. Once we get your CYA reading, we can tell you where to let it drift down to for maintenance chlorine levels.
Your OTO kit will only be able to test to 5ppm but you can force it to go higher by using a dilution method explained here:
Testing Without a Good Kit
Run your pump 24/7 and backwash whenever the pressure goes up 5-10psi over your clean filter pressure.
For now, do not add anything other than bleach to your pool.
(While you are at Walmart getting the OTO kit, go ahead and get a bunch of bleach, some distilled water and also a couple boxes of 20 Mule Team Borax (in the laundry aisle). Don't add any Borax until you find out a current pH reading and post it here.
Repost with testing results and somebody here can help you go from there. Hope this helps!
BTW -- The only algaecide we recommend is Polyquat 60%. Algaecide is a pretty good preventative, but not so great at getting rid of algae once you get it. Chlorine is the thing that kills algae.
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